# How do you calculate formal charge of CO?

The formal charge of carbon monoxide gas is $\text{ZERO}$.
In some representations, we depict charge separation in the carbon monoxide molecule: ""^(-):C-=O^+, and of course, here, the formal charge of the $\text{molecule}$ is still zero. I tend to like this representation because it suggests that carbon monoxide binds thru the carbon nucleus, which is what is typically observed.